Effect of stabilizer on the stability and shape of nonspherical polystyrene particles produced by seeded dispersion polymerization in the presence of saturated hydrocarbon droplets

Shahsavari, Mohammad Reza; Mohammadian, Hossein; Namjoo, Alireza; Saadat, Younes; Hosseinzadeh, Soleyman; Abdolbaghi, Samira

doi:10.1134/s1061933x15010159

Cited by 13 publications

(11 citation statements)

References 28 publications

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“…However, the calculations imply that PVP can stabilize the particles more appropriate than others. We also reported the same stabilization ability for PVP for seeded dispersion polymerization of styrene in our previous work [27]. Such ability can be attributed to the strong chemical bonding of PVP to the surface of the particles during polymerization.…”

Section: Resultsmentioning

confidence: 54%

Micromolding-polymerization as a novel method for production of nonspherical polymer particles: formation mechanism of polystyrene particles

et al. 2015

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In the present study, time course analysis of micromolding-polymerization, as a novel approach for preparation of nonspherical particles, was carried out in order to investigate the formation mechanism of polystyrene particles. It was observed that incomplete half-shell, porous half-shell, and pitted olive-like particle are produced during reaction, respectively. The results showed that the surface area of polystyrene (PS) particles remains constant with increasing styrene conversion from 63 % up to 84 %. In addition, it was shown that particles with high porosity can be obtained during polymerization. Moreover, the effect of particle size distribution of micromolds (solvent-swollen polymeric particles), the presence of an excessive amount of hydrocarbon in the media, and the type of initiator on the shape of particles were investigated. The effect of stabilizer type on the shape and stability of produced particles was another factor that was examined. Production of particles having an almond shell-like shape in the presence of an excessive amount of hydrocarbon was one of the interesting findings of this study. In addition, it was found that the particle shape remains constant with changing stabilizer and initiator type.

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Section: Resultsmentioning

confidence: 54%

Micromolding-polymerization as a novel method for production of nonspherical polymer particles: formation mechanism of polystyrene particles

et al. 2015

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“…4a, b), whereas cage-like particles were seen in the dispersions stabilized by different grades of PVA. It is noteworthy to point out that in our previous study, PVA-80 % and PVA-80.2 % resulted in dispersions with lower stabilities In sealed glass bottles: methanol (23 g), water (4.2 g), styrene (4 g), N 2 , 60°C, 24 h, and tumbled with tumbling device end-over-end at 24 rpm rather than PVP and HPMC; however, they showed a better stabilizing ability in comparison to PVA-55 % [27]. These observations coupled with the ones presented in Fig.…”

Section: Effect Of Stabilizer Typementioning

confidence: 68%

“…Another point which deserves some words here is that the dispersion containing no stabilizer became completely unstable and turned to a big coagulum after polymerization. It seems that such seed particles do not own an appropriate stability by themselves, whereas the beads produced in the presence of PVP showed an excellent stability in the previous study [27]. This difference also can be attributed to the chemical bonds of PVP as it was explained above.…”

Section: Effect Of Stabilizer Typementioning

confidence: 74%

“…It was observed that PVP and HPMC are the best candidates for preparation of stable dispersions. Strong chemical bonding to the surface of particles seemed to be the reason of such stabilizing ability [25][26][27]. On the contrary, particles which were stabilized by PVA-55 % showed very low stability [27].…”

Section: Effect Of Stabilizer Typementioning

confidence: 93%

“…Strong chemical bonding to the surface of particles seemed to be the reason of such stabilizing ability [25][26][27]. On the contrary, particles which were stabilized by PVA-55 % showed very low stability [27]. These results made us to use PVP and HPMC as well as PVA-80 % and PVA-80.2 % as the stabilizer in four separate SDP batches instead of PVA-55 % in order to investigate whether such difference in stabilizing ability has any effect on the fabrication of cage-like shape or not.…”

Section: Effect Of Stabilizer Typementioning

confidence: 98%

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Fabrication of unique cage-like polystyrene particles having lots of dents on the surface via unstable seeded dispersion polymerization

et al. 2015

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Unique, hollow, micron-sized polystyrene (PS) particles having lots of dents on the surface, so-called cage-like particles, were obtained by seeded dispersion polymerization of 2-ethylhexyl methacrylate with PS particles stabilized by poly(vinyl alcohol) in the presence of hexadecane droplets. The effect of main parameters (e.g., average molecular weight of seed particles, and stabilizer and initiator type) responsible for acquiring such particles was investigated. The experimental results revealed that cage-like shape is produced because of particle coagulation during polymerization. Moreover, it was observed that changing stabilizer and initiator type, and employing seed particles with low average molecular weight, which all of them contribute in coagulation of particles, result in the fabrication of cage-like shape.

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Dual-seeded dispersion polymerization: formation mechanism of novel and unique ring-like and almond-shell-like polystyrene particles

et al. 2015

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In the present work, time course analysis of dualseeded dispersion polymerization (DSDP) of 2-ethylhexyl methacrylate (EHMA) with polystyrene (PS) and poly(methyl methacrylate) (PMMA) seed beads in the presence of decane droplets and evaporation of decane after the polymerization was carried out in order to investigate the formation mechanism of almond-shell-like PS particles. It was observed that most of the PMMA seed beads becomes unstable and coagulate in the beginning of the polymerization, whereas shape of PS seed particles changes from golf-ball-like to novel and unique ring-like, and then almond-shell-like one by developing the polymerization. In addition, the effect of the hydrocarbon and PEHMA content on the shape of the obtained particles was studied. The experimental results revealed that shape of PS particles is very sensitive to little changes in decane content. As a matter of fact, decreasing the solvent concentration acts in a way that monomer conversion does. On the other hand, it was observed that asymmetric almond-shell-like particles are produced using different concentrations of PEHMA.

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Effect of stabilizer on the stability and shape of nonspherical polystyrene particles produced by seeded dispersion polymerization in the presence of saturated hydrocarbon droplets

Cited by 13 publications

References 28 publications

Micromolding-polymerization as a novel method for production of nonspherical polymer particles: formation mechanism of polystyrene particles

Micromolding-polymerization as a novel method for production of nonspherical polymer particles: formation mechanism of polystyrene particles

Fabrication of unique cage-like polystyrene particles having lots of dents on the surface via unstable seeded dispersion polymerization

Dual-seeded dispersion polymerization: formation mechanism of novel and unique ring-like and almond-shell-like polystyrene particles

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